• Title/Summary/Keyword: Decladding

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Design of the Dry Powder Device and Slitting Machine Device (탈피복 기계 장치와 건식 분말화 장치 설계)

  • 정재후;윤지섭;김영환;이종열;홍동희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.630-633
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    • 1997
  • Spent fuel decladding device and dry voloxidizer is to separate the spent pellet from spent fuel rod cut by 250mm and to convert the spent pellet into powder form for reuse and/or disposal of the spent fuel. There are two methods in decladding and voloxidation of spent fuel, that is, wet method with chemical material and dry method with mechanical device. In this study, to examine the fuel rod decladding process and the pellet voloxidation process, the devices for the spent fuel decladding and the pellet voloxidation with dry method are developed. The decladding machine is designed to separate pellets from fuel rod by slitting device. And, the voloxidizer is designed to convert the spent pellet which is ceramic form into powder form by oxidation using the multi step mesh, vibrator, and air in the high temperature environment. The result of this study, such as operation condition et., will be utilized in the design of the machine for demonstration.

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Development of Decladding Device for the Spent Fuel Pellet and Experiment (사용후핵연료 소결체 인출장치의 개발 및 실험)

  • 홍동희;윤지섭;정재후;김영환;이종열;김도우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.441-444
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    • 2000
  • The recycling process for reuse of uranium in the spent fuels consists various unit processes and the decladding process to extract the spent fuel pellet from the zirconium-based cladding is the beginning process of the recycling. There are two methods - mechanical and chemical - in the decladding process. In this paper, the mechanical decladding device by using a motor as a driving part and a press pin to separate the pellets from tube has been developed. This device was automated and modularized to make the remote operation and maintenance easy.

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Slitting Test of Simulated Fuel Rod by Using a Newly Developed Decladding Device (실증용 탈피복 장치를 이용한 모의 핵연료 슬릿팅 시험)

  • Jung, J.H.;Hong, D.H.;Kim, Y.H.;Park, B.S.;Lee, J.K.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.141-144
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    • 2006
  • In this study, we developed a decladding device which separates 250 mm length of simulated nuclear spent fuel rod into the pallets and the pieces of the hulls after inserting the rod cut into the module with several pairs of blades. To improve the performance of the equipment, we considered some mechanisms to prevent the rod cut from being exposed or bounced into the hot-cell, to reduce the operation time, and to insert the rods automatically. It is expected that the newly developed system will contribute to prevent radioactive pollution in the hot-cell, reduce the operation time, and to increase the safety of the operators. As a result of the performance test for some mockup fuel rod cuts in the ACP(Advanced Spent Fuel Control Process) facility, it was verified that the decladding device could be applied to the actual fuel rod cut. And it will be able to use for a scale-up facility in the future.

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Experiment on Cutting the SUS and Zircaloy Tubes by Cutter Blade (Cutter blade에 의한 SUS 및 지르칼로이 튜브 절단 실험)

  • 정재후;윤지섭;홍동희;김영환;박기용
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.651-654
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    • 2001
  • In the dismantling process of nuclear spent fuels, the spent fuel rod cutting process, followed immediately by the decladding process, performs the cutting the spent fuel rods to a proper length for fast decladding operation. In this paper, we analyzed the chemical compositions, mechanical properties, and physical characteristics for SUS and zircaloy tubes in order to identify the feasibility of cutter-blade type in cutting SUS and zircaloy tubes. It is considered that material, shape and angle, and heat treatment for fabricating the highly durable cutter blade and also it is investigated that the round-shape sustenance of cross-section, amount of debris production, and fire occurrence for measuring the cutting performance on SUS and zircaloy tubes, spent fuel rod cutting device is designed to be operated automatically through the remote control system for use in Hot Cell(radioactive) area and the electro-driven mechanical parts are modularized for easy maintenance. Results from various experiments confirm the efficiency of this device.

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Design on Main Mechanism of High Throughput Device for Enhancement of Oxidation and Recover Rate (산화속도 및 회수율 향상을 위한 고효율 장치 핵심 메커니즘 설계)

  • Kim, Y.H.;Park, B.S.;Jung, J.H.;Yoon, J.S.;Hwang, J.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.05a
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    • pp.473-476
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    • 2008
  • In this paper, we designed the main mechanism of high throughput device for rod-cuts of spent fuel. For this, we analyzed the mechanical methods(slitting, ball mill, roller straightening) and chemical methods(muffle furnace, rotary kiln). As the results, methods of ball drop and rotary drum for concepts design were selected in the analysis step. For enhancement of oxidation rate, we devised the blades on the reactor with mesh type. Also, for enhancement of decladding rate, we designed ball size and rotation reactor with mesh type and devised the vacuum system for fission products. Mechanisms of oxidation and recovery can simultaneously handle the rod-cuts of spent fuel and independently recover. The results of mechanism design can be used for scale-up of high throughput device.

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Development of Transportation Capsule for Spent Nuclear Fuel Rod Cuts (사용후핵연료봉 이송 Capsule의 개발)

  • Hong D.H.;Jin J.H.;Jung J.H.;Kim K.H.;Yoon J.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.1055-1058
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    • 2005
  • In the ACPF(Advanced spent nuclear fuel Conditioning Process Facility), the spent fuel pellets which are highly radioactive materials are separated with its clad and are fed into the next conditioning process. For this, at the other facility called PIEF(Post Irradiation Examination Facility) a spent fuel rod, 3.5 m long, is cut by 25 cm long which is suitable length fur the decladding process. These rod-cuts are packed into the capsule and are moved to the ACPF. Once the capsule is unloaded in the ACPF, the rod-cut is taken out one-by-one from the capsule and installed on the decladding device. In these processes, the crushed spent fuel pellet can be scattered inside the facilities and thus it contaminate the hot cell. In this paper, we developed the specially designed capsule which prevents the pellets scattering and remarkably reduces the leading and unloading time of the rod-cuts.

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